LavaRand is a system that provides an additional entropy source to our production machines. In the lobby of our San Francisco office, we have a wall of lava lamps (pictured above). A video feed of this wall is used to generate entropy that is made available to our production fleet. We're not the first ones to do this. Our LavaRand system was inspired by a similar system first proposed and built by Silicon Graphics and patented in 1996 (the patent has since expired).